Which K Bulb Is Better

[saltwaterfanatic]

is 6,700k or 18,000k better for corals

 

[Morri]

is 6,700k or 18,000k better for corals

6.7k will provide the most useable light but will look yellow thats why most go to 10k as it gives a more pleasant viewing colour 6.5k will give better growth